Mechanical shoveling device



Oct. l1, 1938.

c. E. sToLTz MECHANICAL SHOVELING DEVICE Original Filed Deo. 9, 1935 5 Sheets-Sheet 1 f las l We? p @ifa/Waff Oct. 11, 1938. Q E STOLTZ 2,132,660

MECHANICAL SHOYELING DEVICE Original Filed Dec. 9, 1935 3 Sheets-Sheet 2 Oct. 11, 1938. c. E, sToLTz MECHANICAL VSHOVELNG DEVICE Original Filed Dec. 9, 1935 3 Sheets-Sheet 3 jywzof' @ar/0421i? mit, 51* EL? ZZ'OIWW ,Patented Oct. 1l, 1938 UNITED STATES PATENT OFFICE MECHANICAL SHOVELING DEVICE Application December 9, 1935, Serial No. 53,453 Renewed July 17, 1937 25 Claims. (Cl. 214-132) This invention relates to improvements in mechanical shoveling devices of the mucking type adapted to shovel in confined spaces, such as mines, and has as its principal objects to pro-7 vide a novel means driven in timed relation with movement of the scoop, for aligning the scoop with its supporting truck, so that it may discharge material rearwardly beyond the rearward end of the truck. Another object of my invention is to so arrange the aligning mechanism that the centering operation will be delayed until the scoop has been elevated above the ground a certain predetermined distance.

This application is a continuation in part of l5 a prior application, Serial No. 17,597, filed April 22, 1935, now Patent No. 2,070,415, dated February 9, 1937, and differs therefrom chiefly in the arrangement of the centering mechanism, in that the centering mechanism herein described and illustrated is arranged so as to come into operation after the scoop has been elevated above the ground a certain distance to enable said scoop to gather a full load and prevent said scoop from engaging and scattering material on the ground during the centering operation.

My invention may be more clearly understood with reference to the accompanying drawings wherein 1 Figure 1 is an enlarged side elevation, of a shoveling machine with parts broken away and shown in substantially longitudinal section, illustrating one form in which my invention may be embodied;

Figure 2 is a top plan View of the shoveling machine shown in Figure l, with certain parts broken away and shown in horizontal section;

Figure 3 is an enlarged fragmentary transverse sectional view taken through the centering mechanism in order to more clearly illustrate certain details thereof;

Figure 4 is an enlarged fragmentary plan view of the centering mechanism with certain parts broken away and shown in horizontal section in order to more clearly illustrate certain details of 4;, said centering mechanism not shown in Figure 3;

and

Figure 5 is a detail plan view of the centering mechanism showing the parts in a different position than in Figure 4.

5,0 In the drawings, the main elements of the machine shown are somewhat similar to those described in my aforementioned prior application, so will only be described herein insofar as is necessary to clearly illustrate one form in which 55 my present invention may be embodied.

In the form shown, the shoveling machine consists of a track mounted truck I0 having aturntable or shovel supporting frame II mounted thereon. Said turntable forms a supporting means for a scoop I2 pivotally mounted on the 5 free ends of supporting beams I3 vand I3a. Said supporting beams are freely mounted at their opposite ends on a shaft I4 extending transversely of said turntable and journaled at its ends in suitable bearing members, indicated by refl0 erence characters I5, I5.

The machine is moved along the track during the shoveling operation for feeding the machine into material it is desired to load, and is propelled along the rails by means of almotor I6 l5 mounted on the under side of the truck I0. Said motor may be of any type well known to those skilled in the art, but is herein preferably shown as being an air motor of an ordinary construction and has driving connection with track 20 wheels I'I, I1 in a suitable manner which will not Y herein be shown or described in detail, since it is no portion of my present invention.

The turntable or shovel frame II includes a relatively flat plate I8 having a cut out central 25 portion adapted to have the lower portion of a housing I9 extend therethrough and be mounted therein in a suitable manner. Said housing is journaled on a shouldered bearing member 23 mounted on a member 24 secured to and extend'- 30 ing upwardly from the central portion of the top side of said truck. Said last-mentioned member is provided with a pair of depending integrally formed keys 25, 25 adapted to engage suitable slots 26, 26 formed in the top side of said truck 35 frame and hold said member from pivotal movement with respect to said truck. Said plate has an annular race 20 mounted on the bottom side thereof which race has a plurality of balls 2I, 2| carried therein adapted to engage and support 40 said plate on an annular wearing strip 22 mounted'on the upper surface of the truck I0.

The means for elevating said scoop to a discharge position includesy a pair of sprockets 21, 21 mounted on the outer ends of a transverse shaft 2B journaled in the beams I3 and I3a. Said sprockets mesh with arcuate racks 29, 29 mounted on the inner sides of vertically disposed side plates 30, 30 extending upwardly from opposite sides of said turntable. The drive to said sprockets includes a'sprocket 33 keyed on said shaft outwardly of the beam I3 and inwardly of the respective sprocket 21. A drive chain 34 meshes with said sprocket and a sprocket 35 on l the transversely extending shaft I4. A motor 36,

' herein preferably shown al of a l type. is mounted at the rearward end of the turntable II and drives said last-named sprocket and the shaft I4 by a chain and sprocket drive, generally indicated by reference character l1.

'I'he scoop I2 is mounted on the free ends of the beams I3 and Ila by means of a. ln'acket 4l extending rearwardly from the upper end of said scoop and a shaft 4I extending through said bracket and beams and held from lateral movement with respect thereto in a suitable manner. Thus, said scoop depends from said beams and turntable and is supported for pivotal movement with respect thereto. so that its forward end. may be disposed adjacent the ground when said beams are in an extreme forward position to permit saidvscoop to gather material from the ground below the level of the track (see Figure l) A pair of parallel-spaced cylinders 43. 43 is provided to pivot said scoop and move it along the ground. Said cylinders are mounted for slidable movement with respect to the beams I3 and I la by means of a shaft 44 mounted at its ends in said beams and pivotally mounted on the inner ends of pistons 4B, 45 and extending through suitable slots 46, 4B formed in said cylinders. 'Ihe forward ends of said cylinders are provided with caps 41, 41, threaded thereon. which are pivotally connected to said scoop by means of a transverse shaft 48V pivotally connected to a bracket 49 disposed beneath the bracket 40.

Fluid under pressure may be admitted to the cylinders 43, 43 through the caps 41, 41 to extend said cylinders and pivot said scoop about the axis of the shaft 4I by means of a suitable system of piping and control mechanism, which is not herein shown or described since it forms no portion oi' my present invention.

During upward and rearward movement of said scoop, pressure is usually held in the cylinders 43, 43 until said scoop reaches a discharge position so that said scoop may be held in such a position to permit material to be readily discharged therefrom by gravity, as is shown by dotted lines in Figure l.

When returning to an initial shoveling position, said scoop is slidably supported on guide cams 50. 50 mounted on the inside of the side plates 30, 30. Said guide cams are engaged by rollers 5I, 5I on the outer ends of the shaft 48 and the upper ends of said guide cams are formed to engage said rollers and form a means for stopping rearward movement of said scoop. Said supporting cams operate on principles similar to those described in my prior application, so will not herein be shown or described in detail, since they form no part of my present invention.

Referring now in particular to the novel Acentering mechanism for aligning the scoop and turntable with the truck frame when the scoop is in a discharge position, as illustrated by dotted lines in Figure 1, so that material may be discharged rearwardly therefrom into a suitable receptacle, such as a mine car I2, the portion of the shaft I4 inwardly of the beams Iland Ila is herein shown as being oppositely threaded towards the center thereof (see Figures 3 and 4). As herein shown, said shaft is provided with a left hand threaded portion 53 extending inwardly frcm the left hand beam Il, and a right hand threaded portion I4 extending inwardly from the right hand beam Ila. Said threaded portions extend to a position disposed substantially :,rsaseo a midway between the beams I3 and I 3a, and are herein shown as terminating at a point offset from the center of said turntable. 'Ihe threaded portion Il has a nut 5B threaded thereon, and the threaded portion I4 has a nut Il threaded thereon. Said nuts are positioned so as to be adjacent the .beams I I and Ita when the scoop is in a lowered position, so that they will simultaneously move toward the center of the turntable upon rotation of said shaft in one direction and upon upward movement of said scoop.

A pair of pivoted arms B1, l1, herein shown as being pivoted for movement about an axis coaxial with the turning axis of the turntable. is adapted to be operatively connectedl with the nuts I5 and Il. respectively. Said anns are provided with interleaving inner portions which are pivotally mounted on a vertical stub shaft Il mounted on and extending upwardly from the member 24. 'I'he outer ends of said pivoted arms are adapted to engage a fixed abutment il. herein shown as being a squared member extending upwardly from the outer end of a forwardly extending arm 60 formed integral with the member 24. Thus, when the turntable is turned by hand until the free end of one of the arms 51 engages the abutment 5l, pivotal movement of said arm will pivot said turntable, and when both of said arms engage the xed abutment 59, said turntable will be locked in an aligned position with respect to said truck, as is illustrated in detail in Figure 5,

The connection between the nuts 55 and 5I, and the arms 51, 51 for pivotally moving said arms upon movement of said nuts, herein comprises a slotted arm BI formed integral with the nut 56 and extending downwardly and forwardly therefrom, and a. slotted arm 63 formed integral with the nut' 56 and extending downwardly and forwardly therefrom. It should herein be noted that the slotted portion of the arm 83 is disposed inwardly of the nut 58 and that the slotted portion of the arm 6I is disposed on the outer portion of the nut 55 to compensate for the fact that the threaded portions of the shaft I4 terminate eccentric of the center of the turntable II.

The slotted portion of the arm 6I is of an L-shaped formation having a base extending inwardly along and substantially parallel with the forward side of said nut and a stem extending longitudinally forwardly from the outer end of said base. In a like manner, the slotted portion of the slotted arm 63 is of a similar formation so that the ends of the bases of each of said slots may extend inwardly toward each other, and said last-named slotted portion is herein shown as being spaced above the slotted portion of the arm 0I so that the ends of the bases of the respective slots may overlap each other when the scoop is in a discharge position (see Figure 5). Said slotted portions of said slotted arms are adapted to engage pins 64, 64 secured to and extending upwardly from the members 51, 51 intermediate the ends thereof.

It will be seen from the foregoing that when the members 51, 51 and nuts 55 and 5B are positioned adjacent the inner sides of the beams I l and Ila, respectively. as is shown in Figure 4. and the sprocket 35 is being rotatably driven by the motor I6 in a direction to elevate said scoop, that said nuts will simultaneously move inwardly toward each other a distance determined by the length of the base of said slots before they will cause pivotal movement of the members 5,1, 51 towards each other.

Thus, when the turntable is turned so that the scoop I2 is positioned to one side or the other of the center line of the truck I0. said scoop may gather its load from the ground and be elevated upwardly a certain predetermined distance before the centering mechanism comes into operation. This enables the gathering operation of the scoop to be more readily controlled than formerly, and prevents the scoop from hitting and scattering loose material onv the ground during the centering operation.

While I have herein shown and described one form in which my invention may be embodied, it will be understood that the construction and arrangement of the various parts may bechanged or altered without departing from the spirit or scope thereof. Furthermore, I do not wish to be construed as limiting myself to the precise construction illustrated, excepting as it may be limited in the appended claims.

I claim as my invention:

1. In a power shovel, a truck, a turntable thereon, a beam pivoted on said turntable for movement about a horizontal axis, a scoop on the free end of said beam adapted to be elevated by said beam from a loading position in front of said truck to a discharge position over the rear end of said truck, means for swinging said beam in a vertical plane including a motor, and means driven by said motor in timed relation with swinging movement of said beam for aligning said scoop with said truck when said scoop reaches a discharge position.

2. In a power shovel, a truck, a turntable thereon, a beam pivoted on said turntable for movement about a horizontal axis, a scoop on the free end of said beam adapted to be elevated by said beam from a loading position in front of said truck to a discharge position over the rear end of said truck, means for swinging said beam including a motor and means driven by said motor in timed relation with swinging movement of said beam for aligning said scoop with said truck when said scoop reaches a discharge position and locking said turntable in such a position until said scoop is moved in a direction towards an initial gathering position.

3. In a power shovel, a truck, a turntable thereon, a beam pivoted on said turntable for movement about a horizontal axis, a scoop on the free end of said beam adapted to be elevated by said beam from a loading position in front of said truck to a discharge position over the rear end of said truck, power-operated means for swinging said beam in a vertical plane including a motor, and means driven by said motor for aligning said scoop with said truck when said scoop reaches a discharge position comprising a stationary member on said truck and a member adapted to engage said stationary member, said member being mounted on said turntable for movement transversely thereof towards the center of said turntable. as said beam is moving toward the rear of said truck.

In a power shovel, a truck, a turntable thereon, a beam pivoted on said turntable for movement about a horizontal axis, a scoop on the free end of said beam adapted to be elevated by said beam from a loading position in iront of said truck to a discharge position over the rear end of said truck, power-operated means for swinging said beam and moving said scoop to a discharge position including a motor, and

means driven by said motor for aligning said scoop with said truck when said scoop reaches a discharge position comprising a stationary member on said truck and a pair of members mounted on said turntable, one of said members being adapted to engage said stationary member when said turntable is turned to one side or the other of the center line of said truck and said members being transversely movable with respect to said turntable from the outer portion to the center thereof as said beam is moving towards the rear of said truck.

5.1n a power shovel, a truck, a turntable thereon, a beam pivoted on said turntable for movement about a horizontal axis, a scoop on the free end of said beam adapted to be elevated by said beam from a loading position in front of said truck to a discharge position over the rear end of said truck, power-operated means for swinging said beam and moving said scoop to a discharge position including a motor, and means driven by said motor for aligning said scoop with said truck when said scoop reaches a discharge position comprising a stationary member on said truck, a shaft driven by said motor, a pair of nuts mounted on said shaft, one of said nuts being adapted to engage said mem'- ber depending upon which side of the truck said turntable is turned and said nuts being simultaneously movable towards the center of said turntable as said beam is moving towards the rear of said truck.

6. In a power shovel, a truck, a turntable thereon, a beam pivoted on said turntable for movement about a horizontal axis, a scoop on the free end of said beam adapted to be elevated by said beam from a loading position in front of said truck to a discharge position over the rear end of said truck, power-operated means for swinging said beam and moving said scoop to a discharge position including a motor, and means driven by said motor for aligning said scoop with said truck when said scoop reaches a discharge position comprising a stationary member on said truck, a shaft having screw threads thereon threaded in opposite directions from the center thereof and a pair of nuts threaded on said shaft, said nuts being adapted to be positioned adjacent the outer end of said shaft when said scoop is positioned adjacent the ground and being movable towards the center of said shaft as said beam moves upwardly.

7. In a power shovel, a truck, a turntable thereon, a beam pivoted on said turntable for movement about a horizontal axis, a scoop on the free end of said beam adapted to be elevated by said beam from a loading position in front of said truck to a discharge position over the rear end of said truck, power-operated means for swinging said beam and moving said scoop to a discharge position including a motor, and means driven by said motor for aligning said scoop with said truck when said scoop reaches a discharge position comprising a stationary member on said truck, a transversely extending shaft on said turntable, a drive connection from said motor to said shaft, a pair of nuts mounted on said shaft and movable therealong upon rotation thereof, said nuts being simultaneously movable towards the center of said turntable as said beam is moving towards the rear of said truck.

8. In a power shovel, a truck, a turntable thereon, a beam pivoted on said turntable for movement about a horizontal axis, a scoop on the free end of said beam adapted to be elevated by said beam from a loading position in front of said truck to a discharge position over the rear end of said truck, power-operated means for swinging said beam and moving said scoop to a discharge position including a motor, and means driven by said motor for aligning said scoop with said truck when said scoop reaches a discharge position comprising a stationary member on said truck, a transversely extending shaft on said turntable coaxial with the pivotal axis of said beam, said shaft having screw threads threaded in opposite directions from the center thereof, and a pair of nuts threaded on said shaft for movement in opposite directions along said shaft upon rotation thereof, said nuts being movable towards the center of said shaft as said beam is moving towards the rear of said truck.

9. In a power shovel, a truck, a turntable thereon, a beam pivoted on said turntable for movement about a horizontal axis, a scoop on the free end of said beam adapted to be elevated by said beam from a loading position in front of said truck to a discharge position over the rear end of said truck, means for swinging said beam including a motor and drive mechanism driven thereby, and means driven by said drive mechanism in timed relation with swinging movement of said beam and arranged coaxial with the pivotal axis of said beam for aligning said scoop with said truck when said scoop reaches a position for the discharge of material from the rear end of said truck.

10. In a power shovel, a truck, a turntable thereon, a beam pivoted on said turntable for movement about a horizontal axis, a scoop on the free end of said beam adapted to be elevated by said beam from a loading position in front of said truck to a discharge position over the rear end of said truck, means for swinging said beam including a motor and drive mechanism driven thereby, and means driven by said drive mechanism in timed relation with swinging movement of said beam and arranged coaxial with the pivotal axis of said beam for aligning said scoop with said truck when said scoop reaches a position for the discharge of material from the rearward end of said truck comprising a rotatable member having a pair of nuts movable therealong in opposite directions towards the center thereof as said beam moves in an upward direction.

11. In a power shovel, a truck, a turntable thereon, a beam pivoted on said turntable for movement about a horizontal axis, a scoop on the free end of said beam adapted to be elevated by said beam from a loading position in front of said truck to a discharge position over the rear end of said truck, power-operated means for swinging said beam including a motor, and means driven by said motor for aligning said scoop with said truck when said scoop reaches a discharge position comprising a rotatable shaft mounted on said turntable and extending transversely thereof, a pair of nuts on said shaft and movable therealong in opposite directions towards the center of said turntable as Said scoop is moving in an upward direction, a stationary member on said truck, and means associated with said nuts adapted to engage said stationary member.

12. In a power shovel, a truck, a turntable thereon, a beam pivoted on said turntable for movement about a horizontal axis, a scoop on the free end of said beam adapted to be elevated by said beam from a loading position in front of said truck to a discharge position over the rear end of said truck, power-operated means for swinging said beam including a motor, and means driven by said motor for aligning said scoop with said truck when said scoop reaches a discharge position comprising a rotatable shaft having screw threads thereon threaded in opposite directions from the center thereof, said shaft being mounted on said turntable and extending transversely thereof and having a pair of nuts threaded thereon and movable in opposite directions towards the center of said turntable as said scoop is moving in an upward direction, a stationary member on said truck, and means associated with said nuts for engagement with said stationary member.

13. In a power shovel, a truck, a turntable thereon, a beam pivoted on said turntable for movement about a horizontal axis, a scoop on the free end of said beam adapted to be elevated by said beam from a loading position in front of said truck to a discharge position over the rear end of said truck, means for swinging said beam in a vertical plane including a motor, and means driven by said motor in timed relation with swinging movement of said beam and initially operable when said scoop has been moved upwardly to a predetermined position for aligning said scoop with said truck when said scoop reaches its discharge position.

14. In a power shovel, a truck, a turntable thereon, a beam pivoted on said turntable for movement about a horizontal axis, a scoop on the free end of said beam adapted to be elevated by said beam from a loading position in front of said truck to a discharge position over the rear end of said truck, means for swinging said beam including a motor, and means driven by said motor in timed relation with swinging movement of said beam and initially operable when said scoop has been moved upwardly to a predetermined position ior aligning said scoop with said truck when said scoop reaches its discharge position comprising a member on said turntable translationally movable transversely thereof, and another member engageable with an abutment fixed from movement with respect to said turntable and moved by said first-mentioned member translationally of said turntable after said firstmentioned member has moved a predetermined distance across said turntable.

15. In a power shovel, a truck, a turntable thereon, a beam pivoted on Said turntable for movement about a horizontal axis, a scoop on the free end of said beam adapted to be elevated by said beam from a loading position in front of said truck to a discharge position over the rear end of said truck, means for swinging said beam including a motor, and means driven by said motor in timed relation with swinging movement of said beam and initially operable when said scoop has been moved upwardly to a predetermined position for aligning said scoop with said truck when said scoop reaches a discharge position, said last-named means comprising a slotted member movable transversely of said turntable, a pivoted member engaged by said slotted member and adapted to engage an abutment fixed from movement with respect to said turntable whereby said slotted member may move a predetermined distance without moving said pivoted member and movement of said slotted member an additional distance will cause pivotal movement of said pivoted member.

16. In a power shovel, a truck, a turntable thereon, a beam pivoted on said turntable for movement about a horizontal axis, a scoop on the free end of said beam adapted to be elevated by said beam from a loading position in front of said truck to a discharge position over the rear end of said truck, means for swinging said beam including a motor, and means driven by said motor in timed relation with swinging movement of said beam and initially operable when said scoop has been moved upwardly to a predetermined position for aligning said scoop with said truck when said scoop reaches its discharge position, said last-named means comprising a threaded shaft rotatably driven by said motor, a nut threaded thereon having a slotted arm extending therefrom, a pivoted arm adapted to be slidably engaged with said slotted arm intermediate its ends and adapted to engage an abutment ilxed from movement with respect to said turntable at its free end, so that said slotted arm may move a predetermined distance and movement of said slotted arm a further distance will cause pivotal movement of said pivoted arm.

17. In a power shovel, a truck, a turntable thereon, a beam pivoted on said turntable for movement about a horizontal axis, a scoop on the free end of said beam adapted to be elevated by said beam from a loading position in front of said truck to a discharge position over the rear end of said truck, means for swinging said beam including a motor, and means driven by said motor in timed relation with swinging movement of said beam for aligning said scoop with said truck when said scoop reaches its discharge position comprising a fixed abutment on said truck, a shaft on said turntable rotatably driven by said motor, a pair of nuts mounted on said shaft and movable in opposite directions therealong upon rotation thereof, a pair of members pivoted for movement about coaxial axes and having free ends adapted to engage said fixed abutment, and arms extending from said nuts, each of said arms being adapted to engage an associated pivoted member intermediate the ends thereof for pivotally moving said members towards the center of said turntable upon movement of said scoop in an upward direction.

18. In a power shovel, a truck, a turntable thereon, a beam pivoted on said turntable for movement about a horizontal axis, a scoop on the free end of said beam adapted to be elevated by said beam from a loading position in front of said truck to a discharge position over the rear end of said truck, means for swinging said beam including a motor, and means driven by said motor in timed relation with swinging movement of said beam and initially operable when said scoop has been moved upwardly to a predetermined position for aligning said scoop with said truck when said scoop reaches its discharge position comprising a fixed abutment on said truck, a shaft on said turntable and rotatably driven by said motor, a pair of nuts mounted on said shaft and movable in opposite directions therealong upon .rotation thereof, a pair of members pivoted for movement about coaxial axes and having free ends adapted to engage said fixed abutment, an arm extending from each of said nuts, each of said arms having a slot therein adapted to form a means for pivoting said pivoted members upon rotation of said shaft, said slots being so formed that said arms may move a predetermined distance towards the center of said turntable before causing pivotal movement of said arms.

19. In a power shovel, a truck, a turntable thereon, a beam pivoted on said turntable for movement about a horizontal axis, a scoop on the free end of said beam adapted to be elevated by said beam from a loading position in front of said truck to a discharge position over the rear end of said truck, means for swinging said beam including a motor, and means driven by said motor in timed relation with swinging movement of said beam and operable when said scoop has been moved upwardly to a predetermined position for aligning said scoop with said truck when said scoop is in a discharge position comprising a fixed abutment on said truck, a shaft on said turntable and rotatably driven by said motor, a pair of nuts mounted on said shaft and movable in opposite directions therealong upon rotation thereof, a pair of members pivoted for movement about coaxial axes and havingfree ends adapted to engage said fixed abutment, an arm extending from each of said nuts, each of said arms having a slot therein adapted to form a means Afor pivoting said pivoted members upon rotation of said shaft, said slots having engaging walls of an L- shaped formation whereby said nuts and arms may move a predetermined distance towards the center of said turntable before causing pivotal movement of said arms.

20. In a shoveling machine, a truck, a turntable thereon, a scoop mounted on said turntable for movement from a loading position in front of said truck to a discharge position over the rear end of said truck, means for moving said scoop from the front to rear of said truck including a motor, and a shaft driven by said motor in timed relation with movement of said scoop having means extensible therealong for aligning said scoop with said truck when said scoop reaches a discharge position.

21. In a shoveling machine, a truck, a turntable thereon, a scoop mounted on said turntable for movement from a loading position in front of said truck to a discharge position over the rear end of said truck, means for moving said scoop from the front to rear of said truck including a motor, and means driven by said motor in timed relation with movement of said scoop and initially operable when said scoop has moved upwardly to a predetermined position for aligning said scoop with said truck when said scoop reaches its discharge position.

22. In a shoveling machine, a truck, a turntable thereon, a scoop mounted on said turntable for movement from a loading position in front of said truck to a discharge position over the rear end of said truck, means for moving said scoop from the front to rear of said truck including a motor, and means driven by said motor in timed relation with movement of said scoop for aligning said scoop with said truck when said scoop reaches a discharge position, and locking said scoop and turntable in such a position until said scoop is again moved in a direction towards an initial gathering position.

23. In a shoveling machine, a truck, a turntable thereon, a scoop mounted on said turntable for movement from a loading position in front of said truck to a discharge position over the rear end of said truck, means for moving said scoop from the front to rear of said truck including a motor, and means driven by said motor in timed relation with movement of said scoop for aligning said scoop with said truck when said scoop reaches a discharge position comprising a stationary member, a shaft driven by said motor,

a pair of nuts on said shaft and movable towards the center thereof upon rotation of said shaft in one direction, one of said nuts being adapted to engage said stationary member for turning said turntable upon movement thereof towards the center of said truck.

24. In a shoveling machine, a truck, a turntable thereon, a scoop mounted on said turntable for movement from a loading position in front of said truck to a discharge position over the rear end of said truck, means for moving said scoop from the front to rear of said truck including a motor, and means driven by said motor in timed relation with movement of said scoop and initially operable when said scoop has moved upwardly to a predetermined position for aligning said scoop with said truck when said scoop reaches its discharge position comprising a member on said turntable translationally movable transversely thereof, and another member engageable with an abutment ilxed from movement withl respect to said turntable and moved by said first-mentioned member translationally of said turntable after said first-mentioned member has moved a predetermined distance across said turntable.

25. In a shoveling machine, a truck, a turntable thereon, a scoop mounted on said turntable for movement from a loading position in front of said truck to a discharge position over the rear end of said truck, means for moving said scoop from the front to rear of said truck including a motor, and means driven by said motor in timed relation with movement of said scoop and initially operable when said scoop has moved upwardly to a predetermined position for aligning said scoop with said truck when said scoop reaches its discharge position, said last-named means comprising a slotted member movable transversely of said turntable, a pivoted member engaged by said slotted member and adapted to engage an abutment fixed from movement with respect to said turntable whereby said slotted member may move a predetermined distance without moving said pivoted member and movement of said slotted member an additional distance will cause pivotal movement of said pivoted member.

CHARLES E. STOLTZ. 

